gdb/config/ns32k/tm-umax.h

   1 /* Definitions to make GDB run on an encore under umax 4.2
   2    Copyright 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 /* This is also included by tm-ns32km3.h, as well as being used by umax.  */
  22
  23 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  24
  25 /* Need to get function ends by adding this to epilogue address from .bf
  26    record, not using x_fsize field.  */
  27 #define FUNCTION_EPILOGUE_SIZE 4
  28
  29 /* Offset from address of function to start of its code.
  30    Zero on most machines.  */
  31
  32 #define FUNCTION_START_OFFSET 0
  33
  34 /* Advance PC across any function entry prologue instructions
  35    to reach some "real" code.  */
  36
  37 extern CORE_ADDR umax_skip_prologue PARAMS ((CORE_ADDR));
  38 #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc))
  39
  40 /* Immediately after a function call, return the saved pc.
  41    Can't always go through the frames for this because on some machines
  42    the new frame is not set up until the new function executes
  43    some instructions.  */
  44
  45 #define SAVED_PC_AFTER_CALL(frame) \
  46         read_memory_integer (read_register (SP_REGNUM), 4)
  47
  48 /* Address of end of stack space.  */
  49
  50 #ifndef STACK_END_ADDR
  51 #define STACK_END_ADDR (0xfffff000)
  52 #endif
  53
  54 /* Stack grows downward.  */
  55
  56 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  57
  58 /* Sequence of bytes for breakpoint instruction.  */
  59
  60 #define BREAKPOINT {0xf2}
  61
  62 /* Amount PC must be decremented by after a breakpoint.
  63    This is often the number of bytes in BREAKPOINT
  64    but not always.  */
  65
  66 #define DECR_PC_AFTER_BREAK 0
  67
  68 #if 0                           /* Disable until fixed *correctly*.  */
  69 #ifndef INVALID_FLOAT
  70 #ifndef NaN
  71 #include <nan.h>
  72 #endif /* NaN */
  73
  74 /* Return 1 if P points to an invalid floating point value.  */
  75 /* Surely wrong for cross-debugging.  */
  76 #define INVALID_FLOAT(p, s) \
  77          ((s == sizeof (float))?        \
  78                 NaF (*(float *) p) :    \
  79                 NaD (*(double *) p))
  80 #endif /* INVALID_FLOAT */
  81 #endif
  82
  83 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  84    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  85    real way to know how big a register is.  */
  86
  87 #define REGISTER_SIZE 4
  88
  89 /* Number of machine registers */
  90
  91 #define NUM_REGS                25
  92
  93 #define NUM_GENERAL_REGS        8
  94
  95 /* Initializer for an array of names of registers.
  96    There should be NUM_REGS strings in this initializer.  */
  97
  98 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
  99                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
 100                         "sp", "fp", "pc", "ps",                         \
 101                         "fsr",                                          \
 102                         "l0", "l1", "l2", "l3", "xx",                   \
 103                         }
 104
 105 /* Register numbers of various important registers.
 106    Note that some of these values are "real" register numbers,
 107    and correspond to the general registers of the machine,
 108    and some are "phony" register numbers which are too large
 109    to be actual register numbers as far as the user is concerned
 110    but do serve to get the desired values when passed to read_register.  */
 111
 112 #define R0_REGNUM 0             /* General register 0 */
 113 #define FP0_REGNUM 8            /* Floating point register 0 */
 114 #define SP_REGNUM 16            /* Contains address of top of stack */
 115 #define AP_REGNUM FP_REGNUM
 116 #define FP_REGNUM 17            /* Contains address of executing stack frame */
 117 #define PC_REGNUM 18            /* Contains program counter */
 118 #define PS_REGNUM 19            /* Contains processor status */
 119 #define FPS_REGNUM 20           /* Floating point status register */
 120 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 121
 122 /* Total amount of space needed to store our copies of the machine's
 123    register state, the array `registers'.  */
 124 #define REGISTER_BYTES \
 125   ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
 126    + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))
 127
 128 /* Index within `registers' of the first byte of the space for
 129    register N.  */
 130
 131 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 132         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 133
 134 /* Number of bytes of storage in the actual machine representation
 135    for register N.  On the 32000, all regs are 4 bytes
 136    except for the doubled floating registers. */
 137
 138 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 139
 140 /* Number of bytes of storage in the program's representation
 141    for register N.  On the 32000, all regs are 4 bytes
 142    except for the doubled floating registers. */
 143
 144 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 145
 146 /* Largest value REGISTER_RAW_SIZE can have.  */
 147
 148 #define MAX_REGISTER_RAW_SIZE 8
 149
 150 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 151
 152 #define MAX_REGISTER_VIRTUAL_SIZE 8
 153
 154 /* Return the GDB type object for the "standard" data type
 155    of data in register N.  */
 156
 157 #define REGISTER_VIRTUAL_TYPE(N) \
 158         (((N) < FP0_REGNUM) ?                           \
 159                 builtin_type_int :                      \
 160                 ((N) < FP0_REGNUM + 8) ?                \
 161                         builtin_type_float :            \
 162                         ((N) < LP0_REGNUM) ?            \
 163                                 builtin_type_int :      \
 164                                 builtin_type_double)
 165
 166 /* Store the address of the place in which to copy the structure the
 167    subroutine will return.  This is called from call_function.
 168
 169    On this machine this is a no-op, because gcc isn't used on it
 170    yet.  So this calling convention is not used. */
 171
 172 #define STORE_STRUCT_RETURN(ADDR, SP)
 173
 174 /* Extract from an array REGBUF containing the (raw) register state
 175    a function return value of type TYPE, and copy that, in virtual format,
 176    into VALBUF.  */
 177
 178 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 179   memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
 180
 181 /* Write into appropriate registers a function return value
 182    of type TYPE, given in virtual format.  */
 183
 184 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 185   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 186
 187 /* Extract from an array REGBUF containing the (raw) register state
 188    the address in which a function should return its structure value,
 189    as a CORE_ADDR (or an expression that can be used as one).  */
 190
 191 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 192 \f
 193 /* Describe the pointer in each stack frame to the previous stack frame
 194    (its caller).  */
 195
 196 /* FRAME_CHAIN takes a frame's nominal address
 197    and produces the frame's chain-pointer. */
 198
 199 /* In the case of the ns32000 series, the frame's nominal address is the FP
 200    value, and at that address is saved previous FP value as a 4-byte word.  */
 201
 202 #define FRAME_CHAIN(thisframe)  \
 203   (!inside_entry_file ((thisframe)->pc) ? \
 204    read_memory_integer ((thisframe)->frame, 4) :\
 205    0)
 206
 207 /* Define other aspects of the stack frame.  */
 208
 209 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 210
 211 /* Compute base of arguments. */
 212
 213 #define FRAME_ARGS_ADDRESS(fi)  \
 214   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 215         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 216
 217 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 218
 219 /* Get the address of the enter opcode for this function, if it is active.
 220    Returns positive address > 1 if pc is between enter/exit,
 221    1 if pc before enter or after exit, 0 otherwise. */
 222
 223 extern CORE_ADDR ns32k_get_enter_addr ();
 224
 225 /* Return number of bytes at start of arglist that are not really args.  */
 226
 227 #define FRAME_ARGS_SKIP 8
 228
 229 /* Put here the code to store, into a struct frame_saved_regs,
 230    the addresses of the saved registers of frame described by FRAME_INFO.
 231    This includes special registers such as pc and fp saved in special
 232    ways in the stack frame.  sp is even more special:
 233    the address we return for it IS the sp for the next frame.  */
 234
 235 extern int umax_frame_num_args PARAMS ((struct frame_info * fi));
 236 #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi)))
 237 \f
 238 /* Things needed for making the inferior call functions.  */
 239
 240 /* Push an empty stack frame, to record the current PC, etc.  */
 241
 242 #define PUSH_DUMMY_FRAME \
 243 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 244   register int regnum;                              \
 245   sp = push_word (sp, read_register (PC_REGNUM));   \
 246   sp = push_word (sp, read_register (FP_REGNUM));   \
 247   write_register (FP_REGNUM, sp);                   \
 248   for (regnum = 0; regnum < 8; regnum++)  \
 249     sp = push_word (sp, read_register (regnum));    \
 250   write_register (SP_REGNUM, sp);                       \
 251 }
 252
 253 /* Discard from the stack the innermost frame, restoring all registers.  */
 254
 255 #define POP_FRAME  \
 256 { register struct frame_info *frame = get_current_frame ();      \
 257   register CORE_ADDR fp;                                         \
 258   register int regnum;                                           \
 259   struct frame_saved_regs fsr;                                   \
 260   struct frame_info *fi;                                                 \
 261   fp = frame->frame;                                             \
 262   get_frame_saved_regs (frame, &fsr);                            \
 263   for (regnum = 0; regnum < 8; regnum++)                         \
 264     if (fsr.regs[regnum])                                        \
 265       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 266   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 267   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 268   write_register (SP_REGNUM, fp + 8);                            \
 269   flush_cached_frames ();                                        \
 270 }
 271
 272 /* This sequence of words is the instructions
 273    enter        0xff,0          82 ff 00
 274    jsr  @0x00010203     7f ae c0 01 02 03
 275    adjspd       0x69696969      7f a5 01 02 03 04
 276    bpt                  f2
 277    Note this is 16 bytes.  */
 278
 279 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 280
 281 #define CALL_DUMMY_START_OFFSET 3
 282 #define CALL_DUMMY_LENGTH       16
 283 #define CALL_DUMMY_ADDR         5
 284 #define CALL_DUMMY_NARGS        11
 285
 286 /* Insert the specified number of args and function address
 287    into a call sequence of the above form stored at DUMMYNAME.  */
 288
 289 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 290 {                                                               \
 291         int     flipped;                                        \
 292         flipped = fun | 0xc0000000;                             \
 293         flip_bytes (&flipped, 4);                               \
 294         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 295         flipped = - nargs * 4;                                  \
 296         flip_bytes (&flipped, 4);                               \
 297         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 298 }